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Berkeley Professor of Computer Science, director of the Center for Intelligent Systems, and co-author of the standard textbook Artificial Intelligence: a Modern Approach", Stuart Russell, gives his conference at the International Joint Conference on Artificial Intelligence in Buenos Aires on July 29, 2015. A group of top tech leaders, including Russell, British scientist Stephen Hawking and Apple co-founder Steve Wozniak, on Tuesday issued a stern warning against the development of so-called killer robots. AFP PHOTO / JUAN MABROMATAJUAN MABROMATA/AFP/Getty Images